attachment wont open

Hi, I just downloaded the free trial of mindjet. I want to try the features before deciding to buy.
For some reason I cannot open my attachment as they do in xmind. This is what I did.
- I click on add attachment, browse for the file, then upload and i now have an attachment icon, paper clip.
- Next I click on the paper clip icon and the name of the attachment appears. I click on that and it asks me if I want to save the document. If I say yes, it tells me that I already have this document in this place, and do I want to replace it. If I click save it replaces the document, and I find no way to open it without leaving the program altogether. If I then try again to open it by clicking on the paper click icon, it takes me through the very same sequence I just described.
Is this suppose to happen or is it me doing smth wrong?

On another note, am I able to work on my maps offline? I tried to save a local copy, but then I cant open it on my laptop. Is it an online tools? As sometimes I work in a poor internet connection.
Dee